*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}


body{
    background-color: #45b29d;

}

section{
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
}

div{
    width: 8px;
    height: 50px;
    background-color: white;
    display: inline-block;
    animation-name: dong;
    animation-duration: 0.4s;
    animation-timing-function: ease-in;
    animation-direction: alternate;
    animation-iteration-count: infinite;

}

section>div:nth-child(2){
    animation-delay: 0.1s
}

section>div:nth-child(3){
    animation-delay: 0.2s
}

section>div:nth-child(4){
    animation-delay: 0.3s
}

section>div:nth-child(5){
    animation-delay: 0.4s
}

section>div:nth-child(6){
    animation-delay: 0.5s
}

section>div:nth-child(7){
    animation-delay: 0.6s
}

section>div:nth-child(8){
    animation-delay: 0.7s
}

section>div:nth-child(9){
    animation-delay: 0.8s
}

section>div:nth-child(10){
    animation-delay: 0.9s
}


@keyframes dong {
    0%{
        transform: scaleY(1);
    }

    100%{
        transform: scaleY(0);
    }


}